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          <h1 class="post-title" itemprop="name headline">Java-Retrofit2使用--自定义转换器</h1>
        

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        <p>###Java Retrofit2使用–自定义转换器<br>Retrofit2的基础使用请参考<a href="http://www.jianshu.com/p/cd7564918521" target="_blank" rel="noopener">Java Retrofit2使用</a></p>
<p><strong>自定义Converter(转换器)</strong><br>retrofit默认情况下支持的converts有Gson,Jackson,Moshi…<br><a id="more"></a></p>
<ol>
<li><p>搭建基础架构<br>这里将自定义一个FastJsonConverterFactory来解析返回的数据，其内部使用阿里巴巴的Fastjson(依赖添加<code>compile &#39;com.alibaba:fastjson:1.2.37&#39;</code>)。<br>首先要搭建好Retrofit2的使用架构，其次在创建Retrofit实例的时候添加一个</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">// 3. 获取实例</span><br><span class="line">Retrofit retrofit = new Retrofit.Builder()</span><br><span class="line">		// 设置OKHttpClient,如果不设置会提供一个默认的</span><br><span class="line">		.client(new OkHttpClient())</span><br><span class="line">		//设置baseUrl</span><br><span class="line">		.baseUrl(url)</span><br><span class="line">		//添加Gson转换器</span><br><span class="line">		.addConverterFactory(FastJsonConverterFactory.create())</span><br><span class="line">		.build();</span><br></pre></td></tr></table></figure>
</li>
<li><p>创建继承与Converter.Factory的FastJsonConverterFactory类，并实现create()，requestBodyConverter(),responseBodyConverter()方法。</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line">/**</span><br><span class="line"> * fastjson解析工厂</span><br><span class="line"> * @author mazaiting</span><br><span class="line"> */</span><br><span class="line">public class FastJsonConverterFactory extends Converter.Factory&#123;</span><br><span class="line"></span><br><span class="line">	public static Factory create() &#123;</span><br><span class="line">		return new FastJsonConverterFactory();</span><br><span class="line">	&#125;</span><br><span class="line">	</span><br><span class="line">	@Override</span><br><span class="line">	public Converter&lt;Info, RequestBody&gt; requestBodyConverter(Type type, Annotation[] parameterAnnotations,</span><br><span class="line">			Annotation[] methodAnnotations, Retrofit retrofit) &#123;</span><br><span class="line">		return new FastJsonRequestConverter();</span><br><span class="line">	&#125;</span><br><span class="line">	</span><br><span class="line">	</span><br><span class="line">	@Override</span><br><span class="line">	public Converter&lt;ResponseBody, Info&gt; responseBodyConverter(Type type, Annotation[] annotations, Retrofit retrofit) &#123;</span><br><span class="line">		return new FastJsonResponseConverter(type);</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p>实现FastJsonRequestConverter类</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line">/**</span><br><span class="line"> * 请求转换类，将Info对象转化为RequestBody对象</span><br><span class="line"> * @author mazaiting</span><br><span class="line"> */</span><br><span class="line">public class FastJsonRequestConverter implements Converter&lt;Info, RequestBody&gt; &#123;</span><br><span class="line">	private static final MediaType MEDIA_TYPE = MediaType.parse(&quot;application/json; charset=UTF-8&quot;);</span><br><span class="line">	private static final Charset UTF_8 = Charset.forName(&quot;UTF-8&quot;);</span><br><span class="line"></span><br><span class="line">	public FastJsonRequestConverter() &#123;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	public RequestBody convert(Info value) throws IOException &#123;</span><br><span class="line">		Buffer buffer = new Buffer();</span><br><span class="line">		Writer writer = new OutputStreamWriter(buffer.outputStream(), UTF_8);</span><br><span class="line">		writer.write(value.toString());</span><br><span class="line">		writer.close();			</span><br><span class="line">		return RequestBody.create(MEDIA_TYPE, buffer.readByteString());</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p>实现FastJsonResponseConverter类</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line">/**</span><br><span class="line"> * fastjson响应转换器，将ResponseBody对象转化为Info对象</span><br><span class="line"> * @author Administrator</span><br><span class="line"> *</span><br><span class="line"> */</span><br><span class="line">public class FastJsonResponseConverter implements Converter&lt;ResponseBody, Info&gt; &#123;</span><br><span class="line">	/**</span><br><span class="line">	 * 反射类型</span><br><span class="line">	 */</span><br><span class="line">	private Type type;</span><br><span class="line">	public FastJsonResponseConverter(Type type) &#123;</span><br><span class="line">		this.type = type;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	public Info convert(ResponseBody value) throws IOException &#123;</span><br><span class="line">		try &#123;</span><br><span class="line">			/**</span><br><span class="line">			 * fastjson解析数据</span><br><span class="line">			 * 此处特别注意： Info应为外部类，并将其类中的成员设置为public，</span><br><span class="line">			 * 否则会无法创建Info对象，从而导致解析异常</span><br><span class="line">			 */</span><br><span class="line">			Info info = JSON.parseObject(value.string(), type);</span><br><span class="line">			System.out.println(info);</span><br><span class="line">			return info;</span><br><span class="line">		&#125; finally &#123;</span><br><span class="line">			value.close();</span><br><span class="line">		&#125;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
</ol>
<p><a href="http://git.oschina.net/zaitingma/codes/xozq5myrc342wfs06ktnb20" target="_blank" rel="noopener">代码下载</a></p>

      
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